Platypeza. 25 



truncate; labium short with a chitinised transverse basal part and 

 not small, somewhat elongate labella. Maxillary palpi one-jointed, 

 sometimes somewhat clubbed. Thorax rectangular, somewhat arched 

 above; there are no acrostichal hairs, but on each side dorsocentral 

 hairs which are generally uniserial, but sometimes pluriserial; the 

 hairs are more or less to quite short, only the two or three last are 

 long bristles, the last as in Callimyia placed rather outwards; the 

 rows do not curve towards humeri in front, or not distinctly; there 

 are small humeral and a number of posthumeral bristles or hairs, 

 a strong præsutural bristle (wanting in injumata), two or a larger 

 number of notopleural bristles, a postalar bristle (in injumata more), 

 but no supraalar bristle; in the intraalar region there is a number 

 of hairs, sometimes more or less bristly. Thorax otherwise bare. 

 There are generally four, sometimes six scutellar marginal bristles, 

 and adventitious hairs or bristles may occur so that the number is 

 larger. Pleura bare except for one or some small prothoracic bristles 

 (generally). Abdomen somewhat elongate, but moderately narrow, 

 sometimes about cylindrical, sometimes more flattened; it consists 

 in the male distinctly of eight segments anterior to the hypopygium 

 on dorsal side, the first somewhat short, the second to sixth of about 

 equal length ; after the sixth follows a small but quite distinct seventh 

 segment, and then a still smaller præhypopygial segment; the hypo- 

 pygium is not large, more or less globular with small end claws and 

 bent in under the venter; it is as usual incised for the anal opening 

 (tentli segment). The legs are very characteristic by the in both 

 sexes more or less dilated hind tibiæ and well to strongly dilated 

 hind tarsi; these latter may otherwise be of various construction; 

 sometimes only the three first, but generally the four first joints 

 are dilated; sometimes metatarsus is the longest joint, at other times 

 it is shorter and the third joint the longest; as a rule the tarsi are 

 more dilated in female than in male and otherwise constructed, 

 often the two basal joints very short, especially second, and this 

 latter quite short below, while the third is here strongly elongated; 

 further the tarsus is in the female characterised by the formation 

 of a peculiar, sharply bordered sole, occupying the anteroventral 

 side of third and fourth joint (a similar sole-formation is also found 

 in the female of Callimyia and Agathomyia on ventral side of third 

 and fourth joint, but is here much less developed on these small 

 joints); in a couple of species also middle tarsi a little dilated. Of 

 bristles only one or two spurs on middle tibiæ are present. Claws 



